Reorganization of East Area Beam Lines Status Report at ATOP meeting
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Transcript of Reorganization of East Area Beam Lines Status Report at ATOP meeting
Reorganization of East Area
Beam Lines
Status Report at ATOP meeting
L.Gatignon, 06/03/2009
EN
L.Gatignon, ATOP, 6 March 2009 Reorganisation of East Area Beam Lines 2
OUTLINE:
Motivation
Guiding principles and strategyConstraints from physics programme Contain radiation
Magnets available
Primary beamsOptimize choice of magnetsDIRAC, Irradiation facilities
Test beamsOptics, layoutPerformance
Practical implementationMagnetsShielding
Time line
Conclusions
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WHY A NEW LAYOUT FOR THE EAST AREA
Triggered by ABOC/ATC days in 2007
Splitters lead to high beam losses in critical regions
- high radiation levels
- no beam loss monitors!
Catastrophic situation of magnets
- 63 magnets of 22 different types, many critically weak and/or no spares
- need 2 weeks to open & close concrete roof shield + cooldown + repair
- space very tight, access extremely difficult
- high radiation levels
- EA has only 8% of #magnets in NA, but needs same #FTE to maintain
No remote control for most systems (motors in particular)
No high level control system, no beam files
Grossly insufficient beam instrumentation – somewhat improved since then
Recommendation: global review of East Area
Note: Operational difficulties with F61N.BVT01 in 2008, T10 only 6 GeV due to two Q800 (smoke traces!), three Q120’s being replaced now…
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THE EAST AREA CONTINUES TO BE POPULAR:
To liberate PS cycles for DIRAC
and still requests being added, due to pressure on beam time!
2007 2008 20090
5
10
15
20
25
Use
r sl
ots
T9+
T10
+T
11
Year
2007 2008 20090
100
200
300
400
500
#Day
s sc
hed
ule
d T
9+T
10+
T11
Year
= Tests
= CLOUD
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Use fewer types of reliable magnets with spares
Reduce roof shielded areas and ease access to equipment
Keep radiation restricted to upstream areas as much as possible
Keep T8 beam and DIRAC installed as it is until the end of DIRAC,
or for IRRAD in case they take over the DIRAC location
Replace SMH1 and F61S.BHZ1 by two MCB magnets in PPM mode,
i.e. no more splitter (F61S.BHZ01 replacement already done).
Could also serve IRRAD as now, through air, however not from ZT7.BHZ01
but from F61S.BHZ02
Design new beam(s) to 1 (or 2) “North target” marguerite(s)
- two decoupled beams, but at the cost of cycle efficiency
- two beams coupled by “wobbling station”, coupled but higher cycle efficiency
Test beams can provide pure hadron and muon secondary beams up to 15 GeV/c
and pure (> 95%) electron beams from conversion (up to about 10 GeV/c)
BASIC PRINCIPLES FOR NEW EAST AREA
Inspired by and similar in spirit to West Area rebuild in the end of the 1990’s!
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MCBMCB
Keep test beam dumpavailable as before, putnow also PPM
at maximum strengthcompatible with PPM
“Poor man’s wobble” ?
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End of primary beam:
1. Switch
Loss of cycle efficiency,but two performing, decoupled test beams
or
2. Wobbling2x better cycle efficiency
but some coupling.Can run as in the past(i.e. on fixed axis), but withsame restrictions as in the past
Concentrate on this option for the moment
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Dismount T7 beam
and deflect towards
IRRAD with F61S.BHZ02
Suppress T11
Suppress T7
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~5x better transmission than present lines!Uses “dummy magnets”
e± pure h±
±
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List of magnets availablefor the new area (only the green ones).
Also documentation!
Could eventually be complemented withmagnets from NA stock (?)
Received on 30/09/2008
MAGNETS
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Please note that this list
is based on huge efforts
(over about one year!)
by the TE/MCS team
(D.Bodart, D.Tommasini
et al), including a test
campaign of 100 spare
magnets in T7 zone
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Start with the primary beams
As short as possible
Compatibility as much as possible with DIRAC
Respect list of magnets wherever possible
i.e. no MNP23, few M105, few narrow magnets!
Maximize lateral separation between beam lines
Try to have primary target(s) in isolated zone (RP-wise)
Make coherent ‘Beatch’ files from extraction to targets (Dirac, North)
and consistent optics files, describing correctly phase space from extraction:
dirac2011, north2011 old files: dirac2008, north2008
t9y2011, t10y2011
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L.Gatignon, ATOP, 6 March 2009 Reorganisation of East Area Beam Lines 15Different central trajectory + changes of magnet types
Not significantly different from 2008
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OPTICS FOR “T9++ BEAM” – UP TO 15 GeV/cSECONDARY BEAM
Even better transmission than generic optics!
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SECONDARY BEAM OPTICS FOR “T10++ BEAM” – UP TO 12 GeV/c
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TURTLE SIMULATION (for C1ACCV=C2ACCH = ±40 mm, C3P = ±1 mm)
X in mm Y in mm
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p/p in %
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SCHEMATIC LAYOUT OF THE TWO SECONDARY BEAMS
(inspired by “West Area 2000” approach)
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30 mrad prod. angle (vertical)
PROTONSDUMPED
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POWER SUPPLY REQUIREMENTS PRIMARY BEAMS
Magnet I max[A] Vmax [V] Rectifier
PRIMARY LINE
BP.QFO1 650 R2g.07
BP.DHZ1 600 60 R2.08
BP.QDE2 400 80 R1.15
BP.DVT1 250 70 R1.17
BP.DVT2 250 70 R1.16
BP.QFO3 400 40 R2.14
BP.BHZ1 600 120 R2.03
BP.QDE4 350 140 R2b.06
SOUTH BRANCH
BS.”SMH1” 500 100 R3.07
BS.BHZ1 300 50 R3.02
BS.QFO1 400 40 R2b.05
BS.QDE2 400 40 R2a.25
BS.DHZ1 180* T1b.01pp
BS.DVT1 600 80 R2g.02
BS.BHZ2 800 150 R2a.20
Magnet I max[A] Vmax [V] Rectifier
DIRAC LINE
BD.BHZ1 400 80 R2.10
BD.BHZ2 400 80 R2g.04
BD.DVT1 200 40 R2b.07
BD.DHZ1 480* 30 T1b.03
BD.QDE1 500 100 R2a.28
BD.QFO2 500 100 R2a.22
SPECTRO 2500 R6.01
NORTH BRANCH
BN.QDE1 250 50 R10.02
BN.QFO2 300 60 R2b.08
BN.DVT1 400* 60 R1.14
BN.BHZ2 800 100 R2g.05
BN.BHZ3 880 200 R3.08
*) Same limit as before
green = as beforered = swapped with other elements
Preliminary
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Magnet I max[A] Vmax [V] Rectifier
“T9 BEAM”
T9.DHZ1 240 150 R2g.03
T9.QFO1 350 25 R2.17
T9.QDE2 350 80 R2a.23
T9.QDE3 350 25 R2g.01
T9.BHZ1 600 150 R2b.01
T9.QFO4* 350 30 R2g.08
T9.QFO5* 350 30 R2g.10
T9.BHZ2 600 150 R2.09
T9.QDE6 700 150 R2.06
T9.BVT1 450 120 R2.12
T9.QFO7 600 120 R2.15
T9.QDE8 700 150 R2.16
T9.DHZ1 240 80 R2.07
T9.DVT2 240 80 R2.04
Magnet I max[A] Vmax [V] Rectifier
“T10 BEAM”
T10.DHZ1 240 150 R2a.27
T10.QFO1 400 30 R2.01
T10.QDE2 450 80 R2.11
T10.QDE3 400 30 R3.05
T10.BHZ1 750 200 R3.04
T10.QFO4* 500 50 R1.18
T10.QFO5* 500 50 R2g.09
T10.BHZ2 750 200 R3.03
T10.QDE6 600 150 R2.13
T10.BVT1 600 150 R2b.04
T10.QFO7 600 150 R2.05
T10.QDE8 400 160 R2.18
T10.DHZ1 240 80 R2a.21
T10.DVT2 240 80 R2g.06
POWER SUPPLY REQUIREMENTS SECONDARY BEAMS
All existing in present T9, T10, T11. Spectrometers (existing!) to be added
*) Could be connected in series Detailed attribution remains to be optimised!
Preliminary
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SPECIAL BEAM OPTICS FOR CLOUD (Beam spot ~2x2 m!!!)
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X [mm]
Y [mm]
Flu
x [a
rbit
rary
un
its]
Y [mm]
X [mm]
Beam Profile at CLOUD
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And this is how it looks ‘on the floor’:
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PS zone
PS zone
Primary zone
Primary zone Sec. zone
Open
Open
DIRAC
DIRAC
Old layout:
New layout:
The shapes are made as overlays on the old, respectively new layout drawing, on the same scales
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How to run two test beams simultaneously
So far: Layout for switch, i.e. run two test beams on different cycles
M20040 mrad Bendto separateNorth branches from DIRAC
MCBto switch from“T9” to “T10”in PPM mode (55 mrad)
2x2 MDXto sweep
8.94 m
“T9”
“T10”
40 mr 55 mr
4.54 m
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Alternative solution:
Advantage: operate both beams on the same cycle
Disadvantages: Larger production angles (degrade with 2 !)
Electron sweeping on/off for both beams
Shorten T9,T10 front-ends by 1 m, hence 5.5 cm closer together
MCB55 mr M100
MDV1
12.5 mr 30 mr
30 mr
“T9”
“T10”
prod = 30 mradH 30 mradV 42 mrad
prod = 30 mradH 35 mradV 46 mrad
M10
0 sw
eep
er f
or
bo
th
~5.54 m
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Or a complete “Wobbling” as in North Area
MCB55 mr M200
MDV1
12.5 mr 30 mr
30 mr
“T9”
“T10”
M200
e.g.
or
At least 4 m longer
Advantage: Get simultaneous operation with larger decoupling (as in North Area T2)
But have to move T9 and T10 beams downstream by at least 4 metres,
i.e. into transit areas
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What does this mean?
Compatibility with requirements from DIRAC/IRRAD and CLOUD
More flexible and better test beams, but (effectively <) 1 less
Higher top momenta, small production angles, choice of particle type
Only use agreed ‘healthy’ magnets with sufficient spares
All magnets and rectifiers exist – reduced cost
Primary beam is dumped almost immediately after target
High (also induced) radiation levels restricted to minimal areas
Very restricted number of magnets is under heavy roof shielding
The ones in a limited zone following the primary area have only a thin roof shield.
Many have no roof shielding.
RP simulations are required to see whether the latter shield can be avoided
Restricted material cost but lots of reshuffling of lines and shielding
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Side remark:
In 2005 a proposal was made to upgrade the controls of the East Area.For the moment in the East Area there is:
no remote control / readout of collimators
control of magnet currents only by working sets and knobs
no easy and convenient beam files
no remote reading of access system and vacuum state
no user applications for reading of beam instrumentation
However, one delay wire chamber + a scintillator were added per beam since then
It seems that this could be an occasion to migrate the East Area controls to Cesar
(i.e. the recently upgraded North Area controls).
At the time the resource estimate (excluding DWC + scints) were about 80 kCHF
for VME crates + Cerenkov upgrades plus a number of man months on the
software side. Now part of this upgrade has been done already (timing, VME).
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Proposed time line
CLOUD changes from Mk2 to Mk3 module in 2011 (tbc)
This requires a larger beam and a larger zone (T11 → T9B zone)
It seems reasonable to synchronize the EA modifications with this change
DIRAC / IRRAD future not well understood at this moment
but new design is essentially decoupled from this question
Rebuild of parts inside PS and of primary zone in shutdown 2010/11,
provided CLOUD has completed its Mk2 program
Continue construction of test beams during the 2011 run
Could probably continue operation of DIRAC during 2011 with
some additional local shielding at exit of the primary zone
Total duration of project: first estimates 8-12 months
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SUMMARY
A conceptual design has been presented for a new East Area
Compatible with approved experiments
Better, more flexible test beams. Users would benefit!
Uses reliable hardware with spares
Restrict radiation hot spots to restricted regions
Easier access to most of equipment in case of failure
Modest material cost, but work to reshuffle lines and shielding
Could start in shutdown 2010/2011 if funding available
Engineering studies needed to finalize RP aspects and resource estimates
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Thanks for your attention
Thanks also for very valuable input and help from many people. In particular I want to mention:
F.Bordry, J.Lettry, W.Kalbreier, D.Tommasini, D.Bodart,
C.Rembser, E.Perez, H.Breuker, R.Steerenberg, J-L.Blanc, Th.Otto, M.Widorski, M.Lazzaroni, Y.Bonnet, …
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VERY PRELIMINARY ESTIMATES (tbc by engineering studies)
Team Item Weeks
Transport Remove roof shielding 6
Transport Remove equipment 2
Transport Remove side shielding walls 2
Survey Trace walls and beam lines on floor 2
Transport Rebuild new shielding walls 4
Transport Install concrete floors in beam areas 4
Transport Install beam elements 4
Survey Align beam elements 4
Transport Rebuild roof shields 4
Magnets Connect magnets (power, cooling, interlks) 4
Vacuum Install and connect vacuum 4
Various Instrumentation, RP monitors, etc 8
Various Tests 4
52 / 30
Total duration could be 7-8 months (?). Primary + PS zone work in 4 months?
green: can be donemostly in the shadow of other activities
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Remember: West Area rebuild in late 1990’s
Beam Length (m) Budget Duration Comments
X5 280 < 250kCHF 14 weeks From H3 splitter
X7 220 < 250kCHF 14 weeks From H3 splitter
H3 600 ~1.1 MCHF 18 weeks From T1 target to H3 splitter.Cost dominated by new T1 target and primary beam dump blocks
Compare to East Area
Beam Length (m)
Primary beam+South branch 65
Dirac line (hardly touched) 75
North branch 30
T9 beam 70
T10 beam 50
Total 290 (215)
The proposed East Area
reorganization seems of
a similar scale as the
rebuild of X5 and X7
(i.e. excluding the H3 part),
which took at the time
a total of 7 months
and 500 kCHF
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X5&X7 beams after upgrade in late 1990’ s:
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T1+H3 modification:
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Nominal Currents
BP (“F61”) beam
QFO1 642.5
DHZ1 0 (< 600)
QDE2 367.2
DVT1 0 (< 250)
DVT2 0 (< 250)
QFO3 388.0
BHZ1 490.7
QDE4 329.6
South branch
“SMH1” 518.1
BHZ1 247.8
QFO1 375.5
QDE2 376.6
DHZ1 0 (< 180)
DVT1 0 (< 600)
BHZ2 0 (< 800)
“DIRAC” beam
BHZ1 369.9
BHZ2 369.9
DVT1 0 (< 200)
DHZ1 0 (< 480)
QDE1 426.9
QFO2 486.7
Spectro < 2500
North branch (A/B)
QDE1 196.9 /
213.8
QFO2 226.1 / 269.5
DVT1 0 (< 400)
BHZ2 763.8
BHZ3 0 /
850.0
“T9” beam (15 GeV/c)
DHZ1 0 (< 240)
QFO1 301.4
QDE2 320.4
QFO3 301.4
BHZ1 560.1
QFO4 338.2
QFO5 338.2
BHZ2 560.1
QDE6 630.1
BVT1 430.7
QFO7 505.2
QDE8 630.1
DHZ2 0 (< 240)
DVT1 0 (< 240)
Spectro < 1000
“T10” beam (12 GeV/c)
DHZ1 0 (< 240)
QFO1 299.1
QDE2 330.8
QFO3 299.1
BHZ1 712.9
QFO4 354.8
QFO5 354.8
BHZ2 712.9
QDE6 417.5
BVT1 386.2
QFO7 446.9
QDE8 277.3
DHZ2 0 (< 240)
DVT1 0 (< 240)